change(aurweb): add parallel tests and improve aurweb.db

This change utilizes pytest-xdist to perform a multiproc test
run and reworks aurweb.db's code. We no longer use a global
engine, session or Session, but we now use a memo of engines
and sessions as they are requested, based on the PYTEST_CURRENT_TEST
environment variable, which is available during testing.

Additionally, this change strips several SQLite components
out of the Python code-base.

SQLite is still compatible with PHP and sharness tests, but
not with our FastAPI implementation.

More changes:
------------
- Remove use of aurweb.db.session global in other code.
- Use new aurweb.db.name() dynamic db name function in env.py.
- Added 'addopts' to pytest.ini which utilizes multiprocessing.
    - Highly recommended to leave this be or modify `-n auto` to
      `-n {cpu_threads}` where cpu_threads is at least 2.

Signed-off-by: Kevin Morris <kevr@0cost.org>

test/test_packages_util.py

@@ -6,7 +6,7 @@ from fastapi import HTTPException
 from fastapi.testclient import TestClient
 
 from aurweb import asgi, db
-from aurweb.models.account_type import USER_ID, AccountType
+from aurweb.models.account_type import USER_ID
 from aurweb.models.official_provider import OFFICIAL_BASE, OfficialProvider
 from aurweb.models.package import Package
 from aurweb.models.package_base import PackageBase
@@ -15,29 +15,20 @@ from aurweb.models.package_vote import PackageVote
 from aurweb.models.user import User
 from aurweb.packages import util
 from aurweb.redis import kill_redis
-from aurweb.testing import setup_test_db
 
 
 @pytest.fixture(autouse=True)
-def setup():
-    setup_test_db(
-        User.__tablename__,
-        Package.__tablename__,
-        PackageBase.__tablename__,
-        PackageVote.__tablename__,
-        PackageNotification.__tablename__,
-        OfficialProvider.__tablename__
-    )
+def setup(db_test):
+    return
 
 
 @pytest.fixture
 def maintainer() -> User:
-    account_type = db.query(AccountType, AccountType.ID == USER_ID).first()
     with db.begin():
         maintainer = db.create(User, Username="test_maintainer",
                                Email="test_maintainer@examepl.org",
                                Passwd="testPassword",
-                               AccountType=account_type)
+                               AccountTypeID=USER_ID)
     yield maintainer